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Minimum capital requirements (Tables) | 12 Months Ended
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Dec. 31, 2020
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract] |
Schedule of Actual and Required Capital Amounts and Ratios | Actual and required capital amounts and ratios are included below for the periods presented.
|  | Actual |  |  |  | Minimum Capital adequacy with capital buffer |  | To be well capitalized under prompt corrective action provisions
|  | Amount |  | Ratio |  |  |  |  |  | Amount |  | Ratio |  | Amount |  | Ratio
December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FB Financial Corporation |  | $ | 1,358,897 |  |  | 15.0 | % |  |  |  |  |  | $ | 952,736 |  |  | 10.5 | % |  | N/A |  | N/A
FirstBank |  | 1,353,279 |  |  | 14.9 | % |  |  |  |  |  | 951,327 |  |  | 10.5 | % |  | $ | 906,026 |  |  | 10.0 | %
Tier 1 Capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FB Financial Corporation |  | $ | 1,090,364 |  |  | 12.0 | % |  |  |  |  |  | $ | 771,262 |  |  | 8.5 | % |  | N/A |  | N/A
FirstBank |  | 1,142,548 |  |  | 12.6 | % |  |  |  |  |  | 770,122 |  |  | 8.5 | % |  | $ | 724,820 |  |  | 8.0 | %
Tier 1 Capital (to average assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FB Financial Corporation |  | $ | 1,090,364 |  |  | 10.0 | % |  |  |  |  |  | $ | 435,064 |  |  | 4.0 | % |  | N/A |  | N/A
FirstBank |  | 1,142,548 |  |  | 10.5 | % |  |  |  |  |  | 435,279 |  |  | 4.0 | % |  | $ | 544,098 |  |  | 5.0 | %
Common Equity Tier 1 Capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FB Financial Corporation |  | $ | 1,060,364 |  |  | 11.7 | % |  |  |  |  |  | $ | 635,157 |  |  | 7.0 | % |  | N/A |  | N/A
FirstBank |  | 1,142,548 |  |  | 12.6 | % |  |  |  |  |  | 634,218 |  |  | 7.0 | % |  | $ | 588,917 |  |  | 6.5 | %
|  | Actual |  |  |  | Minimum Capital adequacy with capital buffer |  | To be well capitalized under prompt corrective action provisions
|  | Amount |  | Ratio |  |  |  |  |  | Amount |  | Ratio |  | Amount |  | Ratio
December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FB Financial Corporation |  | $ | 633,549 |  |  | 12.2 | % |  |  |  |  |  | $ | 545,268 |  |  | 10.5 | % |  | N/A |  | N/A
FirstBank |  | 623,432 |  |  | 12.1 | % |  |  |  |  |  | 540,995 |  |  | 10.5 | % |  | $ | 515,233 |  |  | 10.0 | %
Tier 1 Capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FB Financial Corporation |  | $ | 602,410 |  |  | 11.6 | % |  |  |  |  |  | $ | 441,421 |  |  | 8.50 | % |  | N/A |  | N/A
FirstBank |  | 592,293 |  |  | 11.5 | % |  |  |  |  |  | 437,782 |  |  | 8.50 | % |  | $ | 412,030 |  |  | 8.0 | %
Tier 1 Capital (to average assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FB Financial Corporation |  | $ | 602,410 |  |  | 10.1 | % |  |  |  |  |  | $ | 238,578 |  |  | 4.00 | % |  | N/A |  | N/A
FirstBank |  | 592,293 |  |  | 9.9 | % |  |  |  |  |  | 239,310 |  |  | 4.00 | % |  | $ | 299,138 |  |  | 5.0 | %
Common Equity Tier 1 Capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FB Financial Corporation |  | $ | 572,410 |  |  | 11.1 | % |  |  |  |  |  | $ | 360,979 |  |  | 7.0 | % |  | N/A |  | N/A
FirstBank |  | 592,293 |  |  | 11.5 | % |  |  |  |  |  | 360,526 |  |  | 7.0 | % |  | $ | 334,774 |  |  | 6.5 | %

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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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